Wood from banana shrub (3)
I believe the answer is:
ash
'wood' is the definition.
(wood from an ash tree)
'from banana shrub' is the wordplay.
'from' says the answer is hidden in the clue.
'ASH' can be found hidden inside 'banana shrub'.
(Other definitions for ash that I've seen before include "Tree with pale wood" , "-- Wednesday" , "Residue of burnt matter" , "blonde" , "Fraxinus" .)